wapperen

English translation: scuffing

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Explanation:"Sweep" is one sandblasting technique, hier uit een job grading standard for sandblasting:
"Ability to use the information to determine the type and extent
of cleaning required and the various techniques such as brush, hone, shot, sweep, and spot blasting needed, according to the material, size, and type of item, areas not to be blasted, and the type or combination of abrasives for the various types of metal or nonmetal surfaces."http://www.opm.gov/fedclass/Fws5423.pdf

Het doel van aanstralen is to scuff up, en spotblast de slechte spots. Wapperen is een techniek. Scuff up by making a quick sweeping motion.

Alternative:
whisk = to move with a rapid, sweeping stroke: She whisked everything off the table with her arm.
But this may be only one sweep.

Thanks to all contributors. It would appear that there is no direct equivalent in English for this term. Given the explanation of 'wapperen' that was provided with the question, it is clear that the intended effect is to simply scuff up the substrate as opposed to completely blast-cleanse it. The term that I used in the target text was therefore simply 'scuffing', leaving it to translation of the source text explanation to clarify what is meant by this.3 KudoZ points were awarded for this answer

This is surely jargon, and possibly slang. There may well be an equivalent English term, but finding it in dico would be unlikely, and finding it on the web a matter of luck and/or persistence.
I vaguely remember encountering the term years ago and translating it as 'wiping' (maybe with some qualifying wording), but I can't find any satisfactory support for that now.
Lianne's off-the-cuff term 'scuffing' might not be so bad.

I am not sure there is a professional translation for it. It refers to making a fast back and forth waving movement, with less pressure and greater distance, in order to scuff up the surface.

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Answers

10 hrs confidence: peer agreement (net): -1

plasma coating

Explanation:It sounds to me as though this is referring to some kind of thermal spray coating or thermal plasma coating or possibly powder coating to create a key to which a subsequent surface finish can adhere. Frankly, I am quite uncertain because your passage is still talking about the removal of defective layers of paint yet you say that blast-cleaning has already been described. Defective layers of paint need to be removed before any thermal coating or plasma coating process. However, the manner of application of thermal plasma coatings and similar would involve the use of a jet to apply the coating, which could be waved, and so that could be described as "wapperen". I am really not certain that this is the correct answer but that would be my intuition in the matter.

Ken Cox: see Lianne's explanation\\It's not a question of a conflict, and Lianne's posting is not a hypothesis. 'Wapperen' is a specific abrasive-blasting technique and has nothing to do with plasma coating. See e.g. www.cobla.nl/stralen.html or many other sites.

11 hrs

-> "Wapperen" as waving around with jet application. There are issues of pressure and distance. Application of thermal plasma coating creates a key (not quite scuffing) to which subsequent coating can adhere. I see no conflict with Liane's hypothesis.

Explanation:the text deals with preparation of the substrate. Various Blowing techniques can be used, some with a lot of pressure, such as with sand blasting, and others with less pressure such as when one would blow an acid on the substrate, or even hot air (close by or at a distance so as not to damage the existing paint when a rpair job is undertaken.

Explanation:"Sweep" is one sandblasting technique, hier uit een job grading standard for sandblasting:
"Ability to use the information to determine the type and extent
of cleaning required and the various techniques such as brush, hone, shot, sweep, and spot blasting needed, according to the material, size, and type of item, areas not to be blasted, and the type or combination of abrasives for the various types of metal or nonmetal surfaces."http://www.opm.gov/fedclass/Fws5423.pdf

Het doel van aanstralen is to scuff up, en spotblast de slechte spots. Wapperen is een techniek. Scuff up by making a quick sweeping motion.

Alternative:
whisk = to move with a rapid, sweeping stroke: She whisked everything off the table with her arm.
But this may be only one sweep.

Thanks to all contributors. It would appear that there is no direct equivalent in English for this term. Given the explanation of 'wapperen' that was provided with the question, it is clear that the intended effect is to simply scuff up the substrate as opposed to completely blast-cleanse it. The term that I used in the target text was therefore simply 'scuffing', leaving it to translation of the source text explanation to clarify what is meant by this.